remove autotools files.
much simpler non-autotools build for liblwpb.
remove files generated by protoc, used in make check.
use <stdint.h> like normal human beings.
simplify test suite build. remove autotools usage. actually invoke protoc(1) to generate codegen files, which fixes protobuf version-compatibility issues.
add optional 'make check' target to top-level makefile.
autotools is dead. update build instructions. this closes GH-8